First thing you need to do is check the MX record of your domain. Use https://intodns.com to view your domain's DNS zone. Your domain's MX records must point to your IP address. If they don't point to your IP address, you will not receive any emails.

If you are using external nameservers, for example registrar ones, please contact your registrar and ask how you can point your MX record to your IP address.

If you are using private nameservers, make sure your DNS zone is set up correctly. You manage your DNS zone from our dashboard by going "Actions" > "Edit DNS Zone". If it still doesn't work, please contact our support.